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Simplifying 21 + m = 4m + 12 Reorder the terms: 21 + m = 12 + 4m Solving 21 + m = 12 + 4m Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '-4m' to each side of the equation. 21 + m + -4m = 12 + 4m + -4m Combine like terms: m + -4m = -3m 21 + -3m = 12 + 4m + -4m Combine like terms: 4m + -4m = 0 21 + -3m = 12 + 0 21 + -3m = 12 Add '-21' to each side of the equation. 21 + -21 + -3m = 12 + -21 Combine like terms: 21 + -21 = 0 0 + -3m = 12 + -21 -3m = 12 + -21 Combine like terms: 12 + -21 = -9 -3m = -9 Divide each side by '-3'. m = 3 Simplifying m = 3
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